Tower of Green Power Emerald Cut with Dark Ends.#761

A large tower of green power, emerald cut, with closed ends. This is an impressive emerald cut with great cleanliness and a wonderful medium toned grass green color. It is cut with normal ends despite its closed/dark ends. It weighs 12.30 carats.

To cut a nice gemstone from tourmaline that has closed ends (very little if any light is transmitted down the principle, c, axis.)  restricts your options as a cutter.  The choice of the emerald cut is essential for minimizing the impact of the dark ends caused by their closed nature.   To minimize the amount of incursion of the closed ends into the colorful a/b axis that you hope to accentuate, the “normal” angels (forty degree angles next to the keel) used on the sides and ends of an open emerald cut are recommend to be increased to the seventy degree range for the row of facets closest to the girdle.  The angles are also increased for the corners.  Now I have made the effort outlined above on many of my gemstones with closed ends, but not all.

I have developed personal preferences over the years when it comes to cutting tourmaline.  I have found that traditional cuts are both well suited for my technology and my aesthetics.  So I have come to use only a limited number of more modern cuts to enhance the beauty of appropriate tourmaline.  In the case of tourmaline with closed/dark ends, I have found that I prefer the flash and shape (normal emerald cuts have their girdle corners cut down less than steep ended emerald cuts) of an emerald cut that has the same angles as a normally cut emerald cut.  Yes,  this does increase the amount of darkness in the ends of the emerald cut, but on the posted gemstone and others, with a large ratio  between their length and width, it matters little.

This beautiful large green emerald cut is a tower of green power.  The bands of beautiful green seem to go on forever, but are seated in cups of flash from the reflection of the a/b axis off the ends when it is moved.  The ends are dead/dark when stationary or moved without tilting, but the gemstone has a large ratio of length to width that lessens this effect without demanding steep ends.  So a cutter’s choice has been made and the wonderful medium grass green and purity of this impressive tourmaline shines brightly in the collection.  It weighs 12.30 carats.


About Bruce Fry

I was born in Summit, NJ in 1947 and graduated from Summit High School in 1966. I graduated from the Colorado School of Mines in 1970 and after spending another year in graduate school, I left to see the world of Brazil. After spending some more time discovering myself, I ended up working for the Commonwealth of Pennsylvania for 32 years as an Air Quality Engineer in the Department of Environmental Protection. I retired in 2007 and took up faceting gemstones again after a long hiatus that reached back to my twenties. I had started cutting cabochons when I was 13 and bought my first faceting machine when I was 15, but ran out of money and time until I retired. My great love in gemology is tourmaline and the collection presented here represents my effort to get as much beauty and variety in the colors of tourmaline as I can. I was particularly lucky in being able to get unheated cuprian tourmaline before copper was discovered in gem grade tourmaline from Mozambique.
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